1 // SPDX-License-Identifier: GPL-2.0-only
3 * AMD Secure Encrypted Virtualization (SEV) interface
5 * Copyright (C) 2016,2019 Advanced Micro Devices, Inc.
7 * Author: Brijesh Singh <brijesh.singh@amd.com>
10 #include <linux/bitfield.h>
11 #include <linux/module.h>
12 #include <linux/kernel.h>
13 #include <linux/kthread.h>
14 #include <linux/sched.h>
15 #include <linux/interrupt.h>
16 #include <linux/spinlock.h>
17 #include <linux/spinlock_types.h>
18 #include <linux/types.h>
19 #include <linux/mutex.h>
20 #include <linux/delay.h>
21 #include <linux/hw_random.h>
22 #include <linux/ccp.h>
23 #include <linux/firmware.h>
24 #include <linux/gfp.h>
25 #include <linux/cpufeature.h>
27 #include <linux/fs_struct.h>
28 #include <linux/psp.h>
31 #include <asm/cacheflush.h>
36 #define DEVICE_NAME "sev"
37 #define SEV_FW_FILE "amd/sev.fw"
38 #define SEV_FW_NAME_SIZE 64
40 static DEFINE_MUTEX(sev_cmd_mutex);
41 static struct sev_misc_dev *misc_dev;
43 static int psp_cmd_timeout = 100;
44 module_param(psp_cmd_timeout, int, 0644);
45 MODULE_PARM_DESC(psp_cmd_timeout, " default timeout value, in seconds, for PSP commands");
47 static int psp_probe_timeout = 5;
48 module_param(psp_probe_timeout, int, 0644);
49 MODULE_PARM_DESC(psp_probe_timeout, " default timeout value, in seconds, during PSP device probe");
51 static char *init_ex_path;
52 module_param(init_ex_path, charp, 0444);
53 MODULE_PARM_DESC(init_ex_path, " Path for INIT_EX data; if set try INIT_EX");
55 static bool psp_init_on_probe = true;
56 module_param(psp_init_on_probe, bool, 0444);
57 MODULE_PARM_DESC(psp_init_on_probe, " if true, the PSP will be initialized on module init. Else the PSP will be initialized on the first command requiring it");
59 MODULE_FIRMWARE("amd/amd_sev_fam17h_model0xh.sbin"); /* 1st gen EPYC */
60 MODULE_FIRMWARE("amd/amd_sev_fam17h_model3xh.sbin"); /* 2nd gen EPYC */
61 MODULE_FIRMWARE("amd/amd_sev_fam19h_model0xh.sbin"); /* 3rd gen EPYC */
62 MODULE_FIRMWARE("amd/amd_sev_fam19h_model1xh.sbin"); /* 4th gen EPYC */
65 static int psp_timeout;
67 /* Trusted Memory Region (TMR):
68 * The TMR is a 1MB area that must be 1MB aligned. Use the page allocator
69 * to allocate the memory, which will return aligned memory for the specified
72 #define SEV_ES_TMR_SIZE (1024 * 1024)
73 static void *sev_es_tmr;
75 /* INIT_EX NV Storage:
76 * The NV Storage is a 32Kb area and must be 4Kb page aligned. Use the page
77 * allocator to allocate the memory, which will return aligned memory for the
78 * specified allocation order.
80 #define NV_LENGTH (32 * 1024)
81 static void *sev_init_ex_buffer;
83 static inline bool sev_version_greater_or_equal(u8 maj, u8 min)
85 struct sev_device *sev = psp_master->sev_data;
87 if (sev->api_major > maj)
90 if (sev->api_major == maj && sev->api_minor >= min)
96 static void sev_irq_handler(int irq, void *data, unsigned int status)
98 struct sev_device *sev = data;
101 /* Check if it is command completion: */
102 if (!(status & SEV_CMD_COMPLETE))
105 /* Check if it is SEV command completion: */
106 reg = ioread32(sev->io_regs + sev->vdata->cmdresp_reg);
107 if (FIELD_GET(PSP_CMDRESP_RESP, reg)) {
109 wake_up(&sev->int_queue);
113 static int sev_wait_cmd_ioc(struct sev_device *sev,
114 unsigned int *reg, unsigned int timeout)
118 ret = wait_event_timeout(sev->int_queue,
119 sev->int_rcvd, timeout * HZ);
123 *reg = ioread32(sev->io_regs + sev->vdata->cmdresp_reg);
128 static int sev_cmd_buffer_len(int cmd)
131 case SEV_CMD_INIT: return sizeof(struct sev_data_init);
132 case SEV_CMD_INIT_EX: return sizeof(struct sev_data_init_ex);
133 case SEV_CMD_PLATFORM_STATUS: return sizeof(struct sev_user_data_status);
134 case SEV_CMD_PEK_CSR: return sizeof(struct sev_data_pek_csr);
135 case SEV_CMD_PEK_CERT_IMPORT: return sizeof(struct sev_data_pek_cert_import);
136 case SEV_CMD_PDH_CERT_EXPORT: return sizeof(struct sev_data_pdh_cert_export);
137 case SEV_CMD_LAUNCH_START: return sizeof(struct sev_data_launch_start);
138 case SEV_CMD_LAUNCH_UPDATE_DATA: return sizeof(struct sev_data_launch_update_data);
139 case SEV_CMD_LAUNCH_UPDATE_VMSA: return sizeof(struct sev_data_launch_update_vmsa);
140 case SEV_CMD_LAUNCH_FINISH: return sizeof(struct sev_data_launch_finish);
141 case SEV_CMD_LAUNCH_MEASURE: return sizeof(struct sev_data_launch_measure);
142 case SEV_CMD_ACTIVATE: return sizeof(struct sev_data_activate);
143 case SEV_CMD_DEACTIVATE: return sizeof(struct sev_data_deactivate);
144 case SEV_CMD_DECOMMISSION: return sizeof(struct sev_data_decommission);
145 case SEV_CMD_GUEST_STATUS: return sizeof(struct sev_data_guest_status);
146 case SEV_CMD_DBG_DECRYPT: return sizeof(struct sev_data_dbg);
147 case SEV_CMD_DBG_ENCRYPT: return sizeof(struct sev_data_dbg);
148 case SEV_CMD_SEND_START: return sizeof(struct sev_data_send_start);
149 case SEV_CMD_SEND_UPDATE_DATA: return sizeof(struct sev_data_send_update_data);
150 case SEV_CMD_SEND_UPDATE_VMSA: return sizeof(struct sev_data_send_update_vmsa);
151 case SEV_CMD_SEND_FINISH: return sizeof(struct sev_data_send_finish);
152 case SEV_CMD_RECEIVE_START: return sizeof(struct sev_data_receive_start);
153 case SEV_CMD_RECEIVE_FINISH: return sizeof(struct sev_data_receive_finish);
154 case SEV_CMD_RECEIVE_UPDATE_DATA: return sizeof(struct sev_data_receive_update_data);
155 case SEV_CMD_RECEIVE_UPDATE_VMSA: return sizeof(struct sev_data_receive_update_vmsa);
156 case SEV_CMD_LAUNCH_UPDATE_SECRET: return sizeof(struct sev_data_launch_secret);
157 case SEV_CMD_DOWNLOAD_FIRMWARE: return sizeof(struct sev_data_download_firmware);
158 case SEV_CMD_GET_ID: return sizeof(struct sev_data_get_id);
159 case SEV_CMD_ATTESTATION_REPORT: return sizeof(struct sev_data_attestation_report);
160 case SEV_CMD_SEND_CANCEL: return sizeof(struct sev_data_send_cancel);
167 static void *sev_fw_alloc(unsigned long len)
171 page = alloc_pages(GFP_KERNEL, get_order(len));
175 return page_address(page);
178 static struct file *open_file_as_root(const char *filename, int flags, umode_t mode)
183 const struct cred *old_cred;
185 task_lock(&init_task);
186 get_fs_root(init_task.fs, &root);
187 task_unlock(&init_task);
189 cred = prepare_creds();
191 return ERR_PTR(-ENOMEM);
192 cred->fsuid = GLOBAL_ROOT_UID;
193 old_cred = override_creds(cred);
195 fp = file_open_root(&root, filename, flags, mode);
198 revert_creds(old_cred);
203 static int sev_read_init_ex_file(void)
205 struct sev_device *sev = psp_master->sev_data;
209 lockdep_assert_held(&sev_cmd_mutex);
211 if (!sev_init_ex_buffer)
214 fp = open_file_as_root(init_ex_path, O_RDONLY, 0);
216 int ret = PTR_ERR(fp);
218 if (ret == -ENOENT) {
220 "SEV: %s does not exist and will be created later.\n",
225 "SEV: could not open %s for read, error %d\n",
231 nread = kernel_read(fp, sev_init_ex_buffer, NV_LENGTH, NULL);
232 if (nread != NV_LENGTH) {
234 "SEV: could not read %u bytes to non volatile memory area, ret %ld\n",
238 dev_dbg(sev->dev, "SEV: read %ld bytes from NV file\n", nread);
239 filp_close(fp, NULL);
244 static int sev_write_init_ex_file(void)
246 struct sev_device *sev = psp_master->sev_data;
251 lockdep_assert_held(&sev_cmd_mutex);
253 if (!sev_init_ex_buffer)
256 fp = open_file_as_root(init_ex_path, O_CREAT | O_WRONLY, 0600);
258 int ret = PTR_ERR(fp);
261 "SEV: could not open file for write, error %d\n",
266 nwrite = kernel_write(fp, sev_init_ex_buffer, NV_LENGTH, &offset);
268 filp_close(fp, NULL);
270 if (nwrite != NV_LENGTH) {
272 "SEV: failed to write %u bytes to non volatile memory area, ret %ld\n",
277 dev_dbg(sev->dev, "SEV: write successful to NV file\n");
282 static int sev_write_init_ex_file_if_required(int cmd_id)
284 lockdep_assert_held(&sev_cmd_mutex);
286 if (!sev_init_ex_buffer)
290 * Only a few platform commands modify the SPI/NV area, but none of the
291 * non-platform commands do. Only INIT(_EX), PLATFORM_RESET, PEK_GEN,
292 * PEK_CERT_IMPORT, and PDH_GEN do.
295 case SEV_CMD_FACTORY_RESET:
296 case SEV_CMD_INIT_EX:
297 case SEV_CMD_PDH_GEN:
298 case SEV_CMD_PEK_CERT_IMPORT:
299 case SEV_CMD_PEK_GEN:
305 return sev_write_init_ex_file();
308 static int __sev_do_cmd_locked(int cmd, void *data, int *psp_ret)
310 struct psp_device *psp = psp_master;
311 struct sev_device *sev;
312 unsigned int phys_lsb, phys_msb;
313 unsigned int reg, ret = 0;
316 if (!psp || !psp->sev_data)
324 buf_len = sev_cmd_buffer_len(cmd);
325 if (WARN_ON_ONCE(!data != !buf_len))
329 * Copy the incoming data to driver's scratch buffer as __pa() will not
330 * work for some memory, e.g. vmalloc'd addresses, and @data may not be
331 * physically contiguous.
334 memcpy(sev->cmd_buf, data, buf_len);
336 /* Get the physical address of the command buffer */
337 phys_lsb = data ? lower_32_bits(__psp_pa(sev->cmd_buf)) : 0;
338 phys_msb = data ? upper_32_bits(__psp_pa(sev->cmd_buf)) : 0;
340 dev_dbg(sev->dev, "sev command id %#x buffer 0x%08x%08x timeout %us\n",
341 cmd, phys_msb, phys_lsb, psp_timeout);
343 print_hex_dump_debug("(in): ", DUMP_PREFIX_OFFSET, 16, 2, data,
346 iowrite32(phys_lsb, sev->io_regs + sev->vdata->cmdbuff_addr_lo_reg);
347 iowrite32(phys_msb, sev->io_regs + sev->vdata->cmdbuff_addr_hi_reg);
351 reg = FIELD_PREP(SEV_CMDRESP_CMD, cmd) | SEV_CMDRESP_IOC;
352 iowrite32(reg, sev->io_regs + sev->vdata->cmdresp_reg);
354 /* wait for command completion */
355 ret = sev_wait_cmd_ioc(sev, ®, psp_timeout);
360 dev_err(sev->dev, "sev command %#x timed out, disabling PSP\n", cmd);
366 psp_timeout = psp_cmd_timeout;
369 *psp_ret = FIELD_GET(PSP_CMDRESP_STS, reg);
371 if (FIELD_GET(PSP_CMDRESP_STS, reg)) {
372 dev_dbg(sev->dev, "sev command %#x failed (%#010lx)\n",
373 cmd, FIELD_GET(PSP_CMDRESP_STS, reg));
376 ret = sev_write_init_ex_file_if_required(cmd);
379 print_hex_dump_debug("(out): ", DUMP_PREFIX_OFFSET, 16, 2, data,
383 * Copy potential output from the PSP back to data. Do this even on
384 * failure in case the caller wants to glean something from the error.
387 memcpy(data, sev->cmd_buf, buf_len);
392 static int sev_do_cmd(int cmd, void *data, int *psp_ret)
396 mutex_lock(&sev_cmd_mutex);
397 rc = __sev_do_cmd_locked(cmd, data, psp_ret);
398 mutex_unlock(&sev_cmd_mutex);
403 static int __sev_init_locked(int *error)
405 struct sev_data_init data;
407 memset(&data, 0, sizeof(data));
410 * Do not include the encryption mask on the physical
411 * address of the TMR (firmware should clear it anyway).
413 data.tmr_address = __pa(sev_es_tmr);
415 data.flags |= SEV_INIT_FLAGS_SEV_ES;
416 data.tmr_len = SEV_ES_TMR_SIZE;
419 return __sev_do_cmd_locked(SEV_CMD_INIT, &data, error);
422 static int __sev_init_ex_locked(int *error)
424 struct sev_data_init_ex data;
426 memset(&data, 0, sizeof(data));
427 data.length = sizeof(data);
428 data.nv_address = __psp_pa(sev_init_ex_buffer);
429 data.nv_len = NV_LENGTH;
433 * Do not include the encryption mask on the physical
434 * address of the TMR (firmware should clear it anyway).
436 data.tmr_address = __pa(sev_es_tmr);
438 data.flags |= SEV_INIT_FLAGS_SEV_ES;
439 data.tmr_len = SEV_ES_TMR_SIZE;
442 return __sev_do_cmd_locked(SEV_CMD_INIT_EX, &data, error);
445 static inline int __sev_do_init_locked(int *psp_ret)
447 if (sev_init_ex_buffer)
448 return __sev_init_ex_locked(psp_ret);
450 return __sev_init_locked(psp_ret);
453 static int __sev_platform_init_locked(int *error)
455 int rc = 0, psp_ret = SEV_RET_NO_FW_CALL;
456 struct psp_device *psp = psp_master;
457 struct sev_device *sev;
459 if (!psp || !psp->sev_data)
464 if (sev->state == SEV_STATE_INIT)
467 if (sev_init_ex_buffer) {
468 rc = sev_read_init_ex_file();
473 rc = __sev_do_init_locked(&psp_ret);
474 if (rc && psp_ret == SEV_RET_SECURE_DATA_INVALID) {
476 * Initialization command returned an integrity check failure
477 * status code, meaning that firmware load and validation of SEV
478 * related persistent data has failed. Retrying the
479 * initialization function should succeed by replacing the state
480 * with a reset state.
483 "SEV: retrying INIT command because of SECURE_DATA_INVALID error. Retrying once to reset PSP SEV state.");
484 rc = __sev_do_init_locked(&psp_ret);
493 sev->state = SEV_STATE_INIT;
495 /* Prepare for first SEV guest launch after INIT */
496 wbinvd_on_all_cpus();
497 rc = __sev_do_cmd_locked(SEV_CMD_DF_FLUSH, NULL, error);
501 dev_dbg(sev->dev, "SEV firmware initialized\n");
503 dev_info(sev->dev, "SEV API:%d.%d build:%d\n", sev->api_major,
504 sev->api_minor, sev->build);
509 int sev_platform_init(int *error)
513 mutex_lock(&sev_cmd_mutex);
514 rc = __sev_platform_init_locked(error);
515 mutex_unlock(&sev_cmd_mutex);
519 EXPORT_SYMBOL_GPL(sev_platform_init);
521 static int __sev_platform_shutdown_locked(int *error)
523 struct sev_device *sev = psp_master->sev_data;
526 if (!sev || sev->state == SEV_STATE_UNINIT)
529 ret = __sev_do_cmd_locked(SEV_CMD_SHUTDOWN, NULL, error);
533 sev->state = SEV_STATE_UNINIT;
534 dev_dbg(sev->dev, "SEV firmware shutdown\n");
539 static int sev_platform_shutdown(int *error)
543 mutex_lock(&sev_cmd_mutex);
544 rc = __sev_platform_shutdown_locked(NULL);
545 mutex_unlock(&sev_cmd_mutex);
550 static int sev_get_platform_state(int *state, int *error)
552 struct sev_user_data_status data;
555 rc = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS, &data, error);
563 static int sev_ioctl_do_reset(struct sev_issue_cmd *argp, bool writable)
571 * The SEV spec requires that FACTORY_RESET must be issued in
572 * UNINIT state. Before we go further lets check if any guest is
575 * If FW is in WORKING state then deny the request otherwise issue
576 * SHUTDOWN command do INIT -> UNINIT before issuing the FACTORY_RESET.
579 rc = sev_get_platform_state(&state, &argp->error);
583 if (state == SEV_STATE_WORKING)
586 if (state == SEV_STATE_INIT) {
587 rc = __sev_platform_shutdown_locked(&argp->error);
592 return __sev_do_cmd_locked(SEV_CMD_FACTORY_RESET, NULL, &argp->error);
595 static int sev_ioctl_do_platform_status(struct sev_issue_cmd *argp)
597 struct sev_user_data_status data;
600 memset(&data, 0, sizeof(data));
602 ret = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS, &data, &argp->error);
606 if (copy_to_user((void __user *)argp->data, &data, sizeof(data)))
612 static int sev_ioctl_do_pek_pdh_gen(int cmd, struct sev_issue_cmd *argp, bool writable)
614 struct sev_device *sev = psp_master->sev_data;
620 if (sev->state == SEV_STATE_UNINIT) {
621 rc = __sev_platform_init_locked(&argp->error);
626 return __sev_do_cmd_locked(cmd, NULL, &argp->error);
629 static int sev_ioctl_do_pek_csr(struct sev_issue_cmd *argp, bool writable)
631 struct sev_device *sev = psp_master->sev_data;
632 struct sev_user_data_pek_csr input;
633 struct sev_data_pek_csr data;
634 void __user *input_address;
641 if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
644 memset(&data, 0, sizeof(data));
646 /* userspace wants to query CSR length */
647 if (!input.address || !input.length)
650 /* allocate a physically contiguous buffer to store the CSR blob */
651 input_address = (void __user *)input.address;
652 if (input.length > SEV_FW_BLOB_MAX_SIZE)
655 blob = kzalloc(input.length, GFP_KERNEL);
659 data.address = __psp_pa(blob);
660 data.len = input.length;
663 if (sev->state == SEV_STATE_UNINIT) {
664 ret = __sev_platform_init_locked(&argp->error);
669 ret = __sev_do_cmd_locked(SEV_CMD_PEK_CSR, &data, &argp->error);
671 /* If we query the CSR length, FW responded with expected data. */
672 input.length = data.len;
674 if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) {
680 if (copy_to_user(input_address, blob, input.length))
689 void *psp_copy_user_blob(u64 uaddr, u32 len)
692 return ERR_PTR(-EINVAL);
694 /* verify that blob length does not exceed our limit */
695 if (len > SEV_FW_BLOB_MAX_SIZE)
696 return ERR_PTR(-EINVAL);
698 return memdup_user((void __user *)uaddr, len);
700 EXPORT_SYMBOL_GPL(psp_copy_user_blob);
702 static int sev_get_api_version(void)
704 struct sev_device *sev = psp_master->sev_data;
705 struct sev_user_data_status status;
708 ret = sev_platform_status(&status, &error);
711 "SEV: failed to get status. Error: %#x\n", error);
715 sev->api_major = status.api_major;
716 sev->api_minor = status.api_minor;
717 sev->build = status.build;
718 sev->state = status.state;
723 static int sev_get_firmware(struct device *dev,
724 const struct firmware **firmware)
726 char fw_name_specific[SEV_FW_NAME_SIZE];
727 char fw_name_subset[SEV_FW_NAME_SIZE];
729 snprintf(fw_name_specific, sizeof(fw_name_specific),
730 "amd/amd_sev_fam%.2xh_model%.2xh.sbin",
731 boot_cpu_data.x86, boot_cpu_data.x86_model);
733 snprintf(fw_name_subset, sizeof(fw_name_subset),
734 "amd/amd_sev_fam%.2xh_model%.1xxh.sbin",
735 boot_cpu_data.x86, (boot_cpu_data.x86_model & 0xf0) >> 4);
737 /* Check for SEV FW for a particular model.
738 * Ex. amd_sev_fam17h_model00h.sbin for Family 17h Model 00h
742 * Check for SEV FW common to a subset of models.
743 * Ex. amd_sev_fam17h_model0xh.sbin for
744 * Family 17h Model 00h -- Family 17h Model 0Fh
748 * Fall-back to using generic name: sev.fw
750 if ((firmware_request_nowarn(firmware, fw_name_specific, dev) >= 0) ||
751 (firmware_request_nowarn(firmware, fw_name_subset, dev) >= 0) ||
752 (firmware_request_nowarn(firmware, SEV_FW_FILE, dev) >= 0))
758 /* Don't fail if SEV FW couldn't be updated. Continue with existing SEV FW */
759 static int sev_update_firmware(struct device *dev)
761 struct sev_data_download_firmware *data;
762 const struct firmware *firmware;
763 int ret, error, order;
767 if (!sev_version_greater_or_equal(0, 15)) {
768 dev_dbg(dev, "DOWNLOAD_FIRMWARE not supported\n");
772 if (sev_get_firmware(dev, &firmware) == -ENOENT) {
773 dev_dbg(dev, "No SEV firmware file present\n");
778 * SEV FW expects the physical address given to it to be 32
779 * byte aligned. Memory allocated has structure placed at the
780 * beginning followed by the firmware being passed to the SEV
781 * FW. Allocate enough memory for data structure + alignment
784 data_size = ALIGN(sizeof(struct sev_data_download_firmware), 32);
786 order = get_order(firmware->size + data_size);
787 p = alloc_pages(GFP_KERNEL, order);
794 * Copy firmware data to a kernel allocated contiguous
797 data = page_address(p);
798 memcpy(page_address(p) + data_size, firmware->data, firmware->size);
800 data->address = __psp_pa(page_address(p) + data_size);
801 data->len = firmware->size;
803 ret = sev_do_cmd(SEV_CMD_DOWNLOAD_FIRMWARE, data, &error);
806 * A quirk for fixing the committed TCB version, when upgrading from
807 * earlier firmware version than 1.50.
809 if (!ret && !sev_version_greater_or_equal(1, 50))
810 ret = sev_do_cmd(SEV_CMD_DOWNLOAD_FIRMWARE, data, &error);
813 dev_dbg(dev, "Failed to update SEV firmware: %#x\n", error);
815 dev_info(dev, "SEV firmware update successful\n");
817 __free_pages(p, order);
820 release_firmware(firmware);
825 static int sev_ioctl_do_pek_import(struct sev_issue_cmd *argp, bool writable)
827 struct sev_device *sev = psp_master->sev_data;
828 struct sev_user_data_pek_cert_import input;
829 struct sev_data_pek_cert_import data;
830 void *pek_blob, *oca_blob;
836 if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
839 /* copy PEK certificate blobs from userspace */
840 pek_blob = psp_copy_user_blob(input.pek_cert_address, input.pek_cert_len);
841 if (IS_ERR(pek_blob))
842 return PTR_ERR(pek_blob);
845 data.pek_cert_address = __psp_pa(pek_blob);
846 data.pek_cert_len = input.pek_cert_len;
848 /* copy PEK certificate blobs from userspace */
849 oca_blob = psp_copy_user_blob(input.oca_cert_address, input.oca_cert_len);
850 if (IS_ERR(oca_blob)) {
851 ret = PTR_ERR(oca_blob);
855 data.oca_cert_address = __psp_pa(oca_blob);
856 data.oca_cert_len = input.oca_cert_len;
858 /* If platform is not in INIT state then transition it to INIT */
859 if (sev->state != SEV_STATE_INIT) {
860 ret = __sev_platform_init_locked(&argp->error);
865 ret = __sev_do_cmd_locked(SEV_CMD_PEK_CERT_IMPORT, &data, &argp->error);
874 static int sev_ioctl_do_get_id2(struct sev_issue_cmd *argp)
876 struct sev_user_data_get_id2 input;
877 struct sev_data_get_id data;
878 void __user *input_address;
879 void *id_blob = NULL;
882 /* SEV GET_ID is available from SEV API v0.16 and up */
883 if (!sev_version_greater_or_equal(0, 16))
886 if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
889 input_address = (void __user *)input.address;
891 if (input.address && input.length) {
893 * The length of the ID shouldn't be assumed by software since
894 * it may change in the future. The allocation size is limited
895 * to 1 << (PAGE_SHIFT + MAX_ORDER) by the page allocator.
896 * If the allocation fails, simply return ENOMEM rather than
897 * warning in the kernel log.
899 id_blob = kzalloc(input.length, GFP_KERNEL | __GFP_NOWARN);
903 data.address = __psp_pa(id_blob);
904 data.len = input.length;
910 ret = __sev_do_cmd_locked(SEV_CMD_GET_ID, &data, &argp->error);
913 * Firmware will return the length of the ID value (either the minimum
914 * required length or the actual length written), return it to the user.
916 input.length = data.len;
918 if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) {
924 if (copy_to_user(input_address, id_blob, data.len)) {
936 static int sev_ioctl_do_get_id(struct sev_issue_cmd *argp)
938 struct sev_data_get_id *data;
939 u64 data_size, user_size;
943 /* SEV GET_ID available from SEV API v0.16 and up */
944 if (!sev_version_greater_or_equal(0, 16))
947 /* SEV FW expects the buffer it fills with the ID to be
948 * 8-byte aligned. Memory allocated should be enough to
949 * hold data structure + alignment padding + memory
950 * where SEV FW writes the ID.
952 data_size = ALIGN(sizeof(struct sev_data_get_id), 8);
953 user_size = sizeof(struct sev_user_data_get_id);
955 mem = kzalloc(data_size + user_size, GFP_KERNEL);
960 id_blob = mem + data_size;
962 data->address = __psp_pa(id_blob);
963 data->len = user_size;
965 ret = __sev_do_cmd_locked(SEV_CMD_GET_ID, data, &argp->error);
967 if (copy_to_user((void __user *)argp->data, id_blob, data->len))
976 static int sev_ioctl_do_pdh_export(struct sev_issue_cmd *argp, bool writable)
978 struct sev_device *sev = psp_master->sev_data;
979 struct sev_user_data_pdh_cert_export input;
980 void *pdh_blob = NULL, *cert_blob = NULL;
981 struct sev_data_pdh_cert_export data;
982 void __user *input_cert_chain_address;
983 void __user *input_pdh_cert_address;
986 /* If platform is not in INIT state then transition it to INIT. */
987 if (sev->state != SEV_STATE_INIT) {
991 ret = __sev_platform_init_locked(&argp->error);
996 if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
999 memset(&data, 0, sizeof(data));
1001 /* Userspace wants to query the certificate length. */
1002 if (!input.pdh_cert_address ||
1003 !input.pdh_cert_len ||
1004 !input.cert_chain_address)
1007 input_pdh_cert_address = (void __user *)input.pdh_cert_address;
1008 input_cert_chain_address = (void __user *)input.cert_chain_address;
1010 /* Allocate a physically contiguous buffer to store the PDH blob. */
1011 if (input.pdh_cert_len > SEV_FW_BLOB_MAX_SIZE)
1014 /* Allocate a physically contiguous buffer to store the cert chain blob. */
1015 if (input.cert_chain_len > SEV_FW_BLOB_MAX_SIZE)
1018 pdh_blob = kzalloc(input.pdh_cert_len, GFP_KERNEL);
1022 data.pdh_cert_address = __psp_pa(pdh_blob);
1023 data.pdh_cert_len = input.pdh_cert_len;
1025 cert_blob = kzalloc(input.cert_chain_len, GFP_KERNEL);
1031 data.cert_chain_address = __psp_pa(cert_blob);
1032 data.cert_chain_len = input.cert_chain_len;
1035 ret = __sev_do_cmd_locked(SEV_CMD_PDH_CERT_EXPORT, &data, &argp->error);
1037 /* If we query the length, FW responded with expected data. */
1038 input.cert_chain_len = data.cert_chain_len;
1039 input.pdh_cert_len = data.pdh_cert_len;
1041 if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) {
1047 if (copy_to_user(input_pdh_cert_address,
1048 pdh_blob, input.pdh_cert_len)) {
1055 if (copy_to_user(input_cert_chain_address,
1056 cert_blob, input.cert_chain_len))
1067 static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg)
1069 void __user *argp = (void __user *)arg;
1070 struct sev_issue_cmd input;
1072 bool writable = file->f_mode & FMODE_WRITE;
1074 if (!psp_master || !psp_master->sev_data)
1077 if (ioctl != SEV_ISSUE_CMD)
1080 if (copy_from_user(&input, argp, sizeof(struct sev_issue_cmd)))
1083 if (input.cmd > SEV_MAX)
1086 mutex_lock(&sev_cmd_mutex);
1088 switch (input.cmd) {
1090 case SEV_FACTORY_RESET:
1091 ret = sev_ioctl_do_reset(&input, writable);
1093 case SEV_PLATFORM_STATUS:
1094 ret = sev_ioctl_do_platform_status(&input);
1097 ret = sev_ioctl_do_pek_pdh_gen(SEV_CMD_PEK_GEN, &input, writable);
1100 ret = sev_ioctl_do_pek_pdh_gen(SEV_CMD_PDH_GEN, &input, writable);
1103 ret = sev_ioctl_do_pek_csr(&input, writable);
1105 case SEV_PEK_CERT_IMPORT:
1106 ret = sev_ioctl_do_pek_import(&input, writable);
1108 case SEV_PDH_CERT_EXPORT:
1109 ret = sev_ioctl_do_pdh_export(&input, writable);
1112 pr_warn_once("SEV_GET_ID command is deprecated, use SEV_GET_ID2\n");
1113 ret = sev_ioctl_do_get_id(&input);
1116 ret = sev_ioctl_do_get_id2(&input);
1123 if (copy_to_user(argp, &input, sizeof(struct sev_issue_cmd)))
1126 mutex_unlock(&sev_cmd_mutex);
1131 static const struct file_operations sev_fops = {
1132 .owner = THIS_MODULE,
1133 .unlocked_ioctl = sev_ioctl,
1136 int sev_platform_status(struct sev_user_data_status *data, int *error)
1138 return sev_do_cmd(SEV_CMD_PLATFORM_STATUS, data, error);
1140 EXPORT_SYMBOL_GPL(sev_platform_status);
1142 int sev_guest_deactivate(struct sev_data_deactivate *data, int *error)
1144 return sev_do_cmd(SEV_CMD_DEACTIVATE, data, error);
1146 EXPORT_SYMBOL_GPL(sev_guest_deactivate);
1148 int sev_guest_activate(struct sev_data_activate *data, int *error)
1150 return sev_do_cmd(SEV_CMD_ACTIVATE, data, error);
1152 EXPORT_SYMBOL_GPL(sev_guest_activate);
1154 int sev_guest_decommission(struct sev_data_decommission *data, int *error)
1156 return sev_do_cmd(SEV_CMD_DECOMMISSION, data, error);
1158 EXPORT_SYMBOL_GPL(sev_guest_decommission);
1160 int sev_guest_df_flush(int *error)
1162 return sev_do_cmd(SEV_CMD_DF_FLUSH, NULL, error);
1164 EXPORT_SYMBOL_GPL(sev_guest_df_flush);
1166 static void sev_exit(struct kref *ref)
1168 misc_deregister(&misc_dev->misc);
1173 static int sev_misc_init(struct sev_device *sev)
1175 struct device *dev = sev->dev;
1179 * SEV feature support can be detected on multiple devices but the SEV
1180 * FW commands must be issued on the master. During probe, we do not
1181 * know the master hence we create /dev/sev on the first device probe.
1182 * sev_do_cmd() finds the right master device to which to issue the
1183 * command to the firmware.
1186 struct miscdevice *misc;
1188 misc_dev = kzalloc(sizeof(*misc_dev), GFP_KERNEL);
1192 misc = &misc_dev->misc;
1193 misc->minor = MISC_DYNAMIC_MINOR;
1194 misc->name = DEVICE_NAME;
1195 misc->fops = &sev_fops;
1197 ret = misc_register(misc);
1201 kref_init(&misc_dev->refcount);
1203 kref_get(&misc_dev->refcount);
1206 init_waitqueue_head(&sev->int_queue);
1207 sev->misc = misc_dev;
1208 dev_dbg(dev, "registered SEV device\n");
1213 int sev_dev_init(struct psp_device *psp)
1215 struct device *dev = psp->dev;
1216 struct sev_device *sev;
1219 if (!boot_cpu_has(X86_FEATURE_SEV)) {
1220 dev_info_once(dev, "SEV: memory encryption not enabled by BIOS\n");
1224 sev = devm_kzalloc(dev, sizeof(*sev), GFP_KERNEL);
1228 sev->cmd_buf = (void *)devm_get_free_pages(dev, GFP_KERNEL, 0);
1232 psp->sev_data = sev;
1237 sev->io_regs = psp->io_regs;
1239 sev->vdata = (struct sev_vdata *)psp->vdata->sev;
1242 dev_err(dev, "sev: missing driver data\n");
1246 psp_set_sev_irq_handler(psp, sev_irq_handler, sev);
1248 ret = sev_misc_init(sev);
1252 dev_notice(dev, "sev enabled\n");
1257 psp_clear_sev_irq_handler(psp);
1259 devm_free_pages(dev, (unsigned long)sev->cmd_buf);
1261 devm_kfree(dev, sev);
1263 psp->sev_data = NULL;
1265 dev_notice(dev, "sev initialization failed\n");
1270 static void sev_firmware_shutdown(struct sev_device *sev)
1272 sev_platform_shutdown(NULL);
1275 /* The TMR area was encrypted, flush it from the cache */
1276 wbinvd_on_all_cpus();
1278 free_pages((unsigned long)sev_es_tmr,
1279 get_order(SEV_ES_TMR_SIZE));
1283 if (sev_init_ex_buffer) {
1284 free_pages((unsigned long)sev_init_ex_buffer,
1285 get_order(NV_LENGTH));
1286 sev_init_ex_buffer = NULL;
1290 void sev_dev_destroy(struct psp_device *psp)
1292 struct sev_device *sev = psp->sev_data;
1297 sev_firmware_shutdown(sev);
1300 kref_put(&misc_dev->refcount, sev_exit);
1302 psp_clear_sev_irq_handler(psp);
1305 int sev_issue_cmd_external_user(struct file *filep, unsigned int cmd,
1306 void *data, int *error)
1308 if (!filep || filep->f_op != &sev_fops)
1311 return sev_do_cmd(cmd, data, error);
1313 EXPORT_SYMBOL_GPL(sev_issue_cmd_external_user);
1315 void sev_pci_init(void)
1317 struct sev_device *sev = psp_master->sev_data;
1323 psp_timeout = psp_probe_timeout;
1325 if (sev_get_api_version())
1328 if (sev_update_firmware(sev->dev) == 0)
1329 sev_get_api_version();
1331 /* If an init_ex_path is provided rely on INIT_EX for PSP initialization
1335 sev_init_ex_buffer = sev_fw_alloc(NV_LENGTH);
1336 if (!sev_init_ex_buffer) {
1338 "SEV: INIT_EX NV memory allocation failed\n");
1343 /* Obtain the TMR memory area for SEV-ES use */
1344 sev_es_tmr = sev_fw_alloc(SEV_ES_TMR_SIZE);
1346 /* Must flush the cache before giving it to the firmware */
1347 clflush_cache_range(sev_es_tmr, SEV_ES_TMR_SIZE);
1350 "SEV: TMR allocation failed, SEV-ES support unavailable\n");
1352 if (!psp_init_on_probe)
1355 /* Initialize the platform */
1356 rc = sev_platform_init(&error);
1358 dev_err(sev->dev, "SEV: failed to INIT error %#x, rc %d\n",
1364 psp_master->sev_data = NULL;
1367 void sev_pci_exit(void)
1369 struct sev_device *sev = psp_master->sev_data;
1374 sev_firmware_shutdown(sev);